I'd say no. XP is being left behind by developers, and security updates coming from Microsoft are going to be fewer and fewer until ultimately they stop in about a year and a half give or take. Even for limited use, trying to keep it secure and free of unwanted pests will likely be a burden that will only get harder as time goes by. Every day that passes makes Microsoft that much more likely to just decide that fixing some bug or security issue would require too much time and effort for a 10+ year old OS.
That, and it almost never happens that you use a device ONLY for what you intended at the start. You'll invariably find some other uses for it. Then you'll be constrained by old hardware and probably an even older OS.
I have a W XP desktop and a W 7 desktop. I have the opportunity to buy a "restored" W XP laptop at a good price. It will be used mainly for email, web surfing and simple stuff, while I travel. No business or tech use. I have some small solitaire-type games that only work on XP. Is it a safe assumption that XP will be around and useful for a few more years?
Thanks for all your help. I find your responses an excellent source.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic