Staying in the basepath is the big thing, I think.
If Bautista slid HARD into second base, and took out a middle infielder... Just with his feet, is it called interference? No. Bautista reached out a bit, yes. But he didn't hook his leg or grab him and throw him off balance. It was very mild contact, and i think had virtually no impact on his ability to make the throw to first.
Again, the purpose of this rule was for safety reasons. What about Bautista's slide was unsafe?
Personally, I think you should be able to do whatever the hell you want within the baseline. The fielder needs to get in, make the play, and get out. If the base runner strays, penalize him and the team.
I'll say it now... The Jays will eventually get a call like this go their way... And if it's as Pussyball as this one was, I'll hate it.