Have any kits gone extinct?

[NARSES2]

Are there any models which should be made extinct?

Airfix Re 8. Still gives me nightmares 

[Weaver]

Are there any models which should be made extinct?

Old-tool Airfix Gnat
Revellobox Mystere 4
Old Polish (various brands) TS-11 Iskra

[Dizzyfugu]

Are there any models which should be made extinct?

Old-tool Airfix Gnat
Revellobox Mystere 4
Old Polish (various brands) TS-11 Iskra

Second the Iskra, but I am not certain concerning the Mystère IV. Then I'd rather bury Matchbox' Alpha Jet, very deeply...

[McColm]

The Novo 1/72 Avro Shackleton MR3, is becoming a rare kit to find. Yes there have been copies resulting in warped fuselages and weapon bay doors that don't line up. The Czech Kit should only be bought for spare parts as there's a lot of flash to clean up.
The vacform 1/72 MR.1 should only be tackled by an expert, although AlleyCat do provide a multi-media conversion set based on the Airfix MR.2 donor kit. This kit does work with the Novo kit.
A word of caution the Airfix and Revell kits AEW.2 and MR.2 are not compatible, the Revell kit is cheaper and but lacks internal detailing but you can't see them apart from the cockpit. Whereas the Airfix kits come with alternative parts and tons of detailed parts. The kits are a bit pricey.

[Snowtrooper]

Second the Iskra, but I am not certain concerning the Mystère IV. Then I'd rather bury Matchbox' Alpha Jet, very deeply...

Leave some space in the pit for Matchbox Harrier (devoid of any underfuselage details) and Jaguar (imaginary panel lines, both cannons on T.2, etc.) too. No, wait. A-20 Havoc too.

Though, it's not all bad that Matchbox jumped the gun and made jet kits based on mock-ups and/or prototypes, as they're the only way (except scratchbuild) to make the A-10 prototype (rudders, notably smaller M61A1 instead of GAU-8/A) or pre-production/early series F-14 (totally different wing glove) Even at their worst they at least tried, unlike copycat manufacturers (Kitech/Zhengdefu/Mister/Mastercraft, etc.)

The PM Models kits that are not exclusive to them would not be particularly missed by anyone either (F-5 family, ex-Pioneer F-100C, etc.)

[zenrat]

Mmmmmm yes, mention of PM reminds me - the PM Ta 154 (and the Airfix repop) should go in the hole.