So you honestly believe that if Apple sold the Mac for $1995 with 512k that they would have survived ...
I'm not sure why you persist on raising this straw man from the dead. No one but you has suggested this combination. So, just to bury that straw man once and for all, the two alternatives that actually were discussed by others were:
1) Introduce the 128K Mac at less than 2495.
2) Sell a 512K Mac at about 2495.
And from the actual financial data I've offered, the overall answer is yes, not only would Apple have survived, they most likely would have thrived. Selling as in option 2) above would not have forced a per-unit loss (indeed, the margins would have remained healthy), but would have increased sales volume, and with it, increased market share. Needless to say, that would not have been a bad thing.
Again, it is improper to equate high per-unit margins with high company profits.