EB-2-RI is unlikely as the price of the vintage models is not high enough.
Yeah it is. I haven't checked recently (don't wanna torture myself, I can't be buying any more gear for the next little while) but before the recent sub-prime thing you couldn't get a clean EB2 for less than $1500. A Rivoli, yeah, but considering what John said (he's right - EB2 does use a 335 body - a current production model, though personally I'd like a fatter/deeper body, but that's just me) and the surprise success of the SG RI, along with the similar cult following of the original as the EB0/3s it would still be a good idea and not require any significant re-tooling or capital investment by Gibson
Another good idea would be to try to nail the ABG hybrid market using a EB2/650 inspired design (fatter body, less sustain block). Players want accoustics, but most suck in terms of accoustic tone and volume (construction and aesthetics too) and the cheaper peizo systems sound like ass - It would be nice to have an EB2ish bass to noodle on in my livingroom unplugged, but with SGRI pups so it can still be usefull in a loud full band setting. Also, it's impossible to find a descent shortie ABG - Gibson has been a niche bass maker, with varrying degrees of success, so this seems like a logical step to me given the current market.