No. Apple is a hardware company first and formost. Hardware sales count for a significant portion of their revenue. And I imagine (if ever) it will be a very long time before Apple can take on Microsoft.
Willy S said:
2. How long will Apple issue new versions of MacOS X for current computers?
I cannot imagine that they would ditch their loyal userbase by releasing 10.5, 10.6 that won't work on their own hardware. 10.7.. well.. maybe by that time they'll draw the line.