That will be the day when that will happen, I mean was he the first person to have a national syndicated talk show, or would Howard Stern count? I
Rush had nowhere near the first national syndicated talk show. What made it harder in the past was the cost of telephone line distribution, but there were narrowly distributed independent talk shows in the days when station owners could only have 7 AM and 7 FM shows.
In the 60's, Joe Pyne was syndicated to around 250 other stations. From that point on, regional, single-company and national talk shows proliferated, enhanced a lot by satellite distribution in the 90's.
Heck, Rush Limbaugh began in the late 80's, and he was not alone... there were even all-talk networks soon after. Stern began as a "syndicated" show very slowly, starting when Andy Bloom added him in Philadelphia and then, later, in LA. Remember, stern had very few stations, albeit big ones. Some national talk shows had 400 to 600 stations in that era.