There's just no way they'll convert every standard car anytime soon. From GT5 to GT6 (3 years) they converted a total of 15 cars... so there's still 796 left. I wouldn't mind if instead of adding 100 cars that are new to the series in GT7 they just added 50 new, so the other 50 could be made of the most requested standard conversions.
There's too many great cars in the standards list, at least all of these should be premium in GT7:
Mazda Furai '08
Toyota Supra RZ '97
Subaru Impreza 22B STi '98
Jaguar XJ220 '92
Chaparral 2J '70
Suzuki V6 Escudo Pikes Peak '98
Toyota GT-One '99
Jaguar E Type FHC '61
BMW 2002 turbo '73
Alfa Romeo 155 2.5 V6 TI '93
Lancia Delta S4 Rally Car '85
Toyota Sprinter (E80) Trueno GT-Apex '83
Ford RS200 Rally Car '85
Mercedes-Benz 190E Evolution II '90
Nissan R92CP '92
Saleen S7 '00
RUF CTR "Yellow Bird" '87
BMW M3 (E46) CSL '03
Plymouth Superbird '70
Mercedes-Benz CLK-GTR Race Car '98
It pains me that one of those had to die so we could get
this. They need to get their fucking priorities straight.