Replacing Drywall Railing with Glass Railing
The portions of the wall section that you targeted for removal and replacement with glass are clearly not going to be load bearing because there is nothing directly above them but air. There may be a small degree of structural strength in the lateral motion direction that is offered by drywall being screwed to the stub wall studs but it is hard to tell just how much contribution there really is. 

In any case you surely do not even want to consider removing a single bit of the full height wall sections. 

It may be the best advice to get the paid time of a building engineer for an hour to come in and look at the situation before you make the commitment to start ripping things out.