You think that everyone in a Flex group is going to recommend HTML5?
Flex has never been a product, only the dedicated IDE FlexBuilder or FlashBuilder.
Development of the Flex SDK is now being continued by an Open Source organisation. FlashBuilder will continue to be sold as a product.
You can develop an interactive GUI in loads of technologies. Flex is great for that. The choice is yours.
LOL!! no i donot assume that everybody in flex mailing list will recommend html5. but i was informed by some sources saying it is unstable and will nearly be stop developing...thats why i first asked because i know it is very much appealing...:)
A friendly advice: look for new friends...