They'd have been fine, and felt fine too. The idea that terraces were all a boisterous mass of seething humanity doesn't really tally with the reality. Even "back then" the "normal people" outnumbered the hard-core by a fair margin at most grounds with terraces. One of the good thing about terraces, with the exception of the rare ones that really were rammed full, was that it was very easy to move to part of the ground more suitable if you felt inclined. As such, different parts of the grounds/ends picked up different reputations. There's no real aversion to terracing from English fans*, just the football authorities. Indeed, not only did I stand on a terrace at a top flight rugby game a few weeks back (you could take beer with you onto the terrace as well) but most new rugby grounds being built have large terrace sections. * there are some fans against any return to terracing. Their argument isn't so much about safety, but more along the weird lines of just saying they prefer to sit, and don't want to be made to stand up. The fact that they wouldn't actually be forced to stand somehow doesn't compute.