The iPad will sell like hotcakes and while some preach doomsday for freedom others will make millions developing for it. At the end, pops and moms will be happier than ever with their new computing experience that doesn't crash every day and has to be formatted and reinstalled every other month.
My dad uses his GPS software almost every day (his GPS has Windows software) and likes 1st person shooters. My mom uses her quilting software almost every day. My uncle, a farmer in Iowa, uses QuickBooks for accounting. People have shelves of software that they use/love even if they aren't fans of Windows or OS X. Presuming they buy an iPad and lug their Windows boxes (which neither crash every day nor require reinst…
The fact that your mom can't run her quilting software on it (so far) doesn't mean it can't do all the other things well and be a very welcome addition to her life. It just means she has to keep using her PC for quilting. At least until somebody realizes there's an opportunity for a good quilting app.