Regarding size, I think it affects to those who have weaker computers and smaller resolutions which, while a minority these days, need to be considered. Rule of thumb in my opinion is that if a sig is longer than an averagely small post, it is too long. And if the sig is wider than the resolution of smaller monitors (yes, some still use 800x600 resolutions), then it is too wide. So I think the 220x640 limit for sigs is very reasonable and should be kept that way. Same for the size, especially regarding .gifs, since 10 of them at the same page could easily grind weaker PCs to a halt.
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