I think the PWS's will stay as that provides real time local information they can use.
Nope... they won't... any data that you're sending that gets to mesonet, or similar, through any other 'data send' such as CWOP is already being scraped by WunderWeenies... If you don't believe me, stop sending to WU, maintain any other data feeds, wait a week or longer, and see if, for example, your Mesonet, or CWOP or Whatever doesn't show up on the WUmaps, etc... scraping is cheaper.
...and you can retrieve archive data, at least from Mesonet, by:
creating account at, example, mesowest, and
http://mesowest.utah.edu/cgi-bin/droman/meso_base.cgi?stn=D5536going to "downloiad data" and logging in.
example from NOV 2014 attached
So who needs 'em?