I could care less about Handoff Mac <--> iOS. It's a great feature and I know it's going to be great for many people but usually I'm either on my Mac or on my iPad and the other device is usually somewhere else. However I do look forwards to iOS <---> iOS handoff, and as long as continuity works between My 2010 MBP and my iPhone/iPad then i'm content.
----------
I don't think this is a push just to get you to buy new hardware, the Bluetooth LE issue.
Apple did really do the planned obsolesce in the earlier iOS days and Mac days but more recently they're doing a good job with supporting older hardware.
I mean, handoff may not work with my 2011 MBP, but every other new feature Yosemite feature does , and my 2011 MBP is still running just as smooth and fast as it did day 1 (though my battery did take a hit, especially after installing Yosemite, but that's to be expected with older hardware).
Look at Apple's efforts - the iPad 2 runs iOS 8! Before Apple followed a pattern of full support for 2 versions and heavily crippled support for one, before dropping the product entirely (as far as iOS devices are concerned). Now they're supporting their devices for longer and longer - even Macs from 2007 are supporting Yosemite!
Not only that, it won't be long before a simple Terminal command bypasses the chipset check for Handoff, anyways. There's almost always a work-around, but Apple definitely doesn't treat their computers as a 2 year cycle system. They aren't even really doing it with their iOS devices anymore either. (Look at the iPad 2 and iPhone 4S)