100GB discs would be the domain of recordables (BD-R/RE). The replicated BD-ROM is only specified to DL 50GB.
Since game makers would be using replication to produce their discs, that means they are likely to be limitted to 50GB. But, at this point AFAIK, no game has come on 50GB. So, there is plenty of space to grow for gaming. (Insert bogus argument why DVD is sufficient, here).
Gary
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