Probably, yes. Mostly due to monetary inflation. Dollar bills will probably go in the next 5-6 years too, replaced by coins.

Remember even with low 4% annual inflation, the value of the dollar is cut in HALF every 18 years.

With a few exceptions, there are no 21 tables with minimums below $5 (Sahara Las Vegas, and a few others still have dollar tables). 3 for 2 payoffs are usually made with dollar tokens and US halves, with a few places still using $2.50 chips.