Oh yeah, I've always found the valve stems to be cracking by the time a new tire goes on, so I always replace it regardless of condition.
Thankfully for you, the stems are relatively thick, so you should be good for another year, which I'm assuming is about how long it takes you to burn through a rear tire. Little bit longer for a front.
1990 EX500 - 142,000 miles as of August 12th, 2019
1993 Ducati 900SS - The real canyon carver
2002 EX500 - Undergoing a full restoration