We have PowerPC like it or not, going ARM or Intel now is not the right time, and if I may say so Apple is not doing too good in Intel market, its in the Iphone market they are making money right now.
I don't know what you're talking about here... Apple is doing better with Intel than they ever did with PowerPC. They not only have a larger market share than ever before (largely due to the iPhone's coattails), they have the most profitable segment of the market.
They're doing something like 5-7% of the PC market, by unit. But the bulk of the expensive computers sold. The cheapest Mac laptop you can get costs $1000... the average paid in the USA last year for a laptop was about $520. Apple was below 1.5% of the market by the end of the PowerPC, moving rapidly toward that 1% threshold. Companies like Adobe were thinking about leaving the Mac market -- software critical to Apple's success. In fact, Apple's move into the software business was, originally anyway, designed to shore up the MacOS market in case every other vendor of professional media software took their toys and went home (to Windows, of course).
There is an inherent limit, in the long run, of how successful any single-vendor platform can be when there's a multi-vendor alternative. Apple's probably close to selling the most Macs they ever can, regardless of price. So they don't concentrate on maximizing volume, they concentrate on profit. The same thing is now happening to the iPhone. And why not.. there have been a total of 5 iPhone models since it's inception. And close to 200 Android phones, even though the iPhone had over a year's head start. When it was all proprietary OSs or stale stuff (SymbianOS, Windows Mobile), Apple was closing in on domination. Once there's an multi-platform option, they can't compete on numbers. Same thing will eventually happen to tablets, and probably faster than any really expected.