I think the market is already there, we know many on the forum love betting in this area, and not even a few, soccer speculators are almost all of them in my opinion, as well as other sports.
There is an obvious market for sports betting, but not all sport betting website get popular. If we have lots of existing casino players on playgram somewhat interested in a sports section, that will mean there is obvious demand among players who will keep the section running from launch.
The only real way to know if people are interested is to test run it for a period of time and see. It's up to the team to make the final decision.