3010/4010 why did they quit making them?

IHC finally, quit building the venerable "M", finally, and introduced the 06 series.

AC stopped building only Orange Utility tractors and introduced the 180 and 190 series tractors.

Ford likewise, finally introduced SOMETHING that was not a glorified N series tractor.

CASE, OLIVER, MM, and Massey Furgeson all redesigned their tractors, targeting the John Deere tractors specificly. The Oliver 1800 and 1900 were quickly refined into the much better 1850 and 1950 tractors, Massey brought out the 1100, Case made major improvements in their 30 series. MM refined their tractors, setting their target at 110hp with the G1000!

The 4010 was a resounding success, it stomped the 560 farmall into the mud so far that all you could see was the top of the stack, but you know, that pesky IHC undoubtedly had someting up their sleeve, so by 1964, it was necessary to provide a major product improvement. After all, IHC had had three years time to take the 4010 apart and develope something to "beat it"!

As it turned out, that "something" was the 806, and had Deere rested on it's laurels, an 80hp 4010 would have faced a 95hp 806 Farmall, so along with the other improvements, Deere introduced improved tractors and remained competitive.

You might have noticed that IHC found it necessary to deliberately make their tractors about 5hp "bigger" than the John Deere they were competing with. The 71hp 3020 faced the 76hp 756 and the 95hp 4020 faced the 100hp 856! It appeared that IHC NEEDED those extra ponies to convice people to buy their red tractors and not the green ones! The regular "features" were apparantly not any advantage for IHC.

What tractor did IHC come out with to compete with the 5020?

Say, how do you suppose that 4300 does against a WA-14 or a WA-17?