WFIL was not an original, therefore it can not claim to have had influence.
That's ridiculous. Much of The Beatles' music can be traced to old school rhythm and blues. Are you prepared to argue The Beatles cannot claim to have influenced future musicians? I know of about a dozen jocks who say Terry "Motormouth" Young was one of their biggest influences. A quick listen of just about any Jackson Armstrong aircheck shows what an influence "Your Leeeee-dah" had on Motormouth. Two of the biggest influences on my style of airwork (whether doing talk, news, or jocking) are Jim Nettleton and Tony Bruno. Does this mean I could never influence anyone?!
99% of what's been done in radio, even stuff from the good 'ole days, was really imitation. I think history judges these endeavors, as others have pointed out, by how much of an impact they had on their markets and the industry overall.
WFIL was one of those stations that came about at the right place, at the right time, and pretty much did just about everything right for a good eight to ten years. It could have lasted longer had Philadelphia not been such an early FM market.
WFIL wasn't an actual Drake station, though like many AM Top 40 ones of the day was heavily influenced and affected by the success of Drake-Chenault. Its programming success was largely the doing of PD Jay Cook, with early guidance from consultant Mike Joseph. (A decade later Joseph would use many of the same techniques to construct his "Hot Hits" format, which of course arrived here in 1981.) It's hard to believe there was a time when a PD (not "consultant", "regional VP of programming", or the like) could have so much power and influence in the crafting and operation of a station. The closest Philly ever had to Drake was probably the Paul Drew era of WIBG, complete with the Johnny Mann jingles but with more of a regional twist to the music.
I don't agree with the severity of Fred's comments about Wibbage, but do realize the station wasn't helped by its failing to adapt to a very changing radio environment. As someone above indicated, Hy Lit and others tried to get management to make adjustments but were usually met with authoritative resistance. By the time changes finally started happening, most of the guys who made the station famous were on their way out, WFIL was firmly in control, and WIBG's fate was sealed. (The signal problems didn't help.) But in its heyday, there was nothing "wrong with" WIBG. It was the right thing in the right place at the right time (just like I said about WFIL's coming on in 1966). And by the mid '60s, that time was probably over.
WFIL, and of course WABC, were two of the most successful non-Drake AM Top 40s of their day. The two had very different sounds, with WFIL's probably sounding closer to the "norm" for the time as Fred alluded. WABC in its earlier days (early '60s), to me, was closer to WIBG in sound. Unlike Wibbage, though, 'ABC quickly evolved and tightened up. And while it wasn't nearly as tight as the other ABC O&O AM Top 40s, its headstart and monster signal kept the station at the top for a good decade following.
AM Top 40 buffs nationwide, even today, largely hold Jay Cook's WFIL in a very high regard. I don't disagree.