I used to use my Intel 80GB in a similar fashion, as a boot drive and had maybe a few games on there and that was it. It didn't bug me too much since WoW is the main game I play and the main reason I got an SSD in the first place.
Still, with digital download services the new normal way to buy a game, combined with the hassle of moving individual games away from the download-service parent folder, there is a lot of hassle associated with having different games installed on different drives.
If 128GB is big enough to fit all your games including your Steam and Origin folders then it could work.
I'm not sure what hardware you are running but another thing you could look into is SSD caching. On a Z68 chipset you could use your existing 80GB SSD as cache for a mechanical drive. You would then install all of your games onto your mechanical drive and anything you use will be cached and benefit from the increased speed of the SSD.
It's nice because at any given time your SSD will be filled with stuff you actually use, while requiring zero effort on your part to manage anything, and you can do it with a smaller SSD instead of paying through the nose for an expensive larger drive.