Bump would work very well with the show today. Penny Ante would also be good, as it's a quickie GP game. Walk of Fame could work with an automatic second chance on the first mistake (I'm trying to think of good games with the time constraints the show faces today). Credit Card may work with the old rules, or even as a 4-prize game (avoid the most expensive prize, the opposite of Shopping Spree).
I can also see Give or Keep/Finish Line and/or Hurdles coming back. Poker Game would work well, and I can't see why they can't play it with 4-digit prizes. I think Drew would do very well at hosting it, as he has a history with poker. I think Drew is a good enough host that if they brought back Buy or Sell and/or Make Your Mark that Drew would host them well and without difficulty.
I could possibly see a 4-card version of Joker coming back. They could also re-work Shower Game to make it seem a bit less goofy.
Heck, if they can bring back a crappy game like Time Is Money, I have faith that the production team could rework better retired games into the show now.
On an interesting note, back when the show had a blog on their website, I asked Fingers what two retired games does she miss the most. Her response: Hurdles and It's Optional. Considering car options are playing a bigger part in changing the prices of cars, I could possibly see this one making a comeback in this day and age.