Classic has numerous pieces of scientific software, games, education stuff etc. If macintel sales are slow, perhaps it is partly because of the lack of Classic support. This is a business decision by Apple not to support Classic, and it is likely a stumbling block keeping many longtime Apple users from upgrading. Therefore, likely a poor business decision. Apple has a culture of Mac going for it, and part of this culture are loyal users. By turning their back on them (or at least waiting to announce Classic emulation), they are in turn perhaps selling fewer macintels.
Please don't respond with 'I'm glad Classic is dead.' (why would you be glad?)
or 'those long time users don't buy anything' (they want to buy new macintels!)
or 'Just buy an iMac G5' (why should one be stuck buying a slower machine that costs the same?)