Some time ago, I saw an interview on YT where he said he'd be more than happy to bring Bobby back on screen if asked... I guess we'll just have to wait "Mr Big Money" to ask him.
It may happen sooner than we think; i read they're already thinking about a commemorative Law&Order mothership mini-series. If it'll work show-buisness people may decide to invest more in revivals (aren't they alredy doing it with X-files?)
If they tried to close the whole LOCI universe with two crappy cameos and a few lines, well, they gotmit wrong. I can't deny those episodes ever aired, I can't avoid acknowledging them, but I also can't accept them.