They will still be around but slightly different.
It will be necessary to tone down or get rid of unscriptural requirements and teachings. For example the teaching that Armageddon is imminent - you just can't go on shouting 'Ice-berg dead ahead!' for 150 years and not expect people to get a bit cynical, even JWs. There is also the publicly unacceptable face of JWism - the blood issue and disfellowshipping for example. The Internet will force the WBTS to face and alter their stand on these things out of necessity if they are to grow.
Because I believe the more harmful teachings of the WBTS will be downgraded and abandoned I think that they will be still going strong as a religion in 20 years time, although, as I've said, they will be a different religion than they are today.
I even think they will be bigger than they are now.
That is, if they change, which logic demands. On the other hand they could be so stupid and arrogant that they will refuse to change. In which case they are doomed. They are arrogant, yes, but I don't think they are that stupid!
As for religion disappearing altogether I think that's many hundreds of years away. It is too highly ingrained in all societies yet for that to happen.
Oh and welcome to Benny!