While ideologies tend to change with each generation, it is my belief that the rate of technological advancements corresponds the shift in generational ideology. For example, many youth in the US find it absurd that Supreme Court justices use mail couriers rather than email yet interpret laws regarding cyberspace; like many other politicians, the same logic can be applied to many politicians since it is harder for older people to connect and understand the younger generation and their technology. This is visible in most, if not all, debates on net neutrality.
But more the point, these technological shifts change the way voters perceive issues and live their lives, and as a natural consequence, politicians must adapt. A good example of this was Hillary Clinton using old methods of propaganda (such as platitudes and failure to address controversy head-on) to win over voters; it backfired (along with many other reasons) whereas the outreach to voters from the Trump campaign can all fit on a bumper sticker. This appeals to a generation of people conditioned by technology (ex: phones, apps to skip ads, social media, etc) to have shorter attention span; coupled with lowered education standards (in regards to literacy and STEM), this enables a politician like Trump to exploit a vulnerability of a democratic system.
Perhaps the best example of this is the source of news for most people. Many work long hours and do not have time to keep up on current events. It seems today that news from one source contradicts news from another source. If two people google the same keywords, they will get different results based on their preferences. If team blue only gets blue news and team red gets red news, then both people are in a bubble accusing the other of being factually wrong. And given that TV media killed print media, it's harder to find universally accepted sources. The average age of a FOX viewer is 70 and the average age of an MSNBC viewer is 65. Most youth don't follow TV news; even Pewty Pie (unsure of spelling) gets comparable views on youtube playing video games than mainstream cable news! (For those that do not believe Russia hacked the DNC, this may partially explain why alternative media - such as Russia Today RT - is being labelled propaganda, as their viewership among youth has increased as cable news viewership is declining.) It seems relevant given that most youth get their information from youtube, online blogs, reddit, etc.
In places where the corporate media stranghold is not as powerful, changes unlike that in the US (and Britain with Brexit, France with the conservative winning over the relatively liberal incumbent, Germany with the rise in neo-nazi sentiment and immigration concerns, etc) are taking place. For example, the Pirate Party of Iceland, which was a third party not long ago, is now basically a major political party. Interestingly enough, a lot of Wikileaks work is done there, and their press freedoms and liberties have gone unexploited in a similar vein, causing the opposite shift in ideology.
This is my opinion based on facts, so I don't know how to prove this. Also, it is often hard to discern actual change from noisy data until enough time has passed. It is worth noting that "outsider" candidates have won past elections and although current news sourcing contributes to partisanship over ideology, both parties have been polarized in the past. Had the number of US voters increased rather than decreased from last election, I would be more confident about my answer. However, half the country does not vote, implying large error bars.
Question for Op:
Had Hillary Clinton or Bernie Sanders won the electoral vote, would you still think an ideological shift is happening?