There's an important line at the top of the URL that was initially referenced....
"Python, Ruby, PHP, and JavaScript are becoming increasingly popular".... Many are moving towards some of those tools in some way. VFP is a great product, but every major trend is downward to some degree. That's not a slam. It's just that VFP is not gaining in popularity.
Someone mentioned the RW enhancements in VFP9 as a counter-argument - nice enhancements, but long overdue (as well as better SQL-92 support). If it takes that long to add capabilities that are present in other products, it's very very unlikely that MS will invest the time and $$$ on a much bigger strategic decision. In the end, as others stated, it's a business decision.
Years ago when the announcement was made that VFP would not be part of the CLR, I recall a number of people in the Fox community breathing a sigh of relief that Fox wouldn't have to stay "tied" to the CLR.
Kevin