Hello Headmath...
That being said about the 144,000 possibly not being a literal number. The way I see it is, that going to heaven is just a state of being at 'one' with God and Christ, rather than floating up into the sky. I also think that, when we put on the incorruptible bodies, they will be bodies, that will be perfect instead of the ones we have now; in the fallen flesh. And I believe that the 144,000 and the great crowd have the same hope, and that is life on EARTH>.. But that's just my opinion... Good night..getting late..here in Michigan..