This is the truth. The Patriots have arguably the most talented TE duo in NFL history to go along with one of the best quarterbacks of all-time in his prime. Teams can try the TE-offense all they want, but it will only benefit them if they are utilizing two of their best offensive weapons. The Patriots didn't go into this saying "we are going to re-create the two TE-offense". They are just using their personnel to their advantage, with two of their best playmakers being tight ends (although Hernandez is not even a complete tight end and is more of WR/TE hybrid.)
Personally, if I were building a team from scratch and needed to find players to fit a scheme, rather than the other way around, I'd target good receivers. I think a 4 WR offense is easier to build because there are tons of great WRs around the league and most teams don't have 3-4 cornerbacks that can match up. TEs are very hard to find, especially those that can block and catch. TEs like Gronk, well, he's really one of a kind right now, and the only past TEs similar I can remember are Tony Gonzalez and Antonio Gates (in their primes). As for Hernandez, I'm not sure of many TEs that are faster than most receivers but still big enough to hold their ground. Point being, both Gronk and Hernandez don't really have any equals in exactly what they add to an offense.