17's on a 1962 Valiant Wagon

It is my belief that eventually we are going to have to go to a larger wheel. Think about how many tire manufactories are depending on the 16 and larger wheels now days. My friend who owns an older model VW bug has a hard time finding 15" tires. He said he used to use Firestone but they quit making them. Then he went to another brand tire from Pep Boys and he said that they quit making those as well. Its getting to where the 15" are slowly becoming harder to get like the 13" and 14". It's not immediately happening but its headed that way.