The poll has been up for a few days now in one of the biggest Facebook groups, https://www.facebook.com/groups/VintageMTG/permalink/1233536173411127/.
119 think there should be a change. 44 think there shouldn't be a change. That's a ratio of 2.7, or 73%.
102 think that Mentor should be restricted. 63 think that Gush should be restricted. Both numbers are substantially more than the people who want no change.
36 also want Gitaxian Probe restricted, and 23 want Misstep restricted. That rounds out those that are within a ratio of 0.5 of the No change people.
The top unrestrict cards were Balance followed by Ponder, Chalice and Golem.
It seems pretty clear from these results that a vast majority of Vintage player's want change.
Of those who want change, a majority specifically identify Gush and Mentor as targets for restriction.
However, I want to see how this sample compares to those here, but the polling option doesn't seem to be function so I made a doodle poll: http://doodle.com/poll/xgi5gp9e47cp336g