HTML form attribs and css animations help to some extent, but only scripts can do everything that html, css, and js can do.
sure you can make page like it's 1999, and those pages will work, but people expect more.
the bottom line is often budgetary: is it worth 50-100% more effort to support <1% of the market, or would your time be better spent making the "99s" version really awsome?
BROWSER STATS [% share]
(2013/10/31) IE7:0.5, IE8:8.6, IE9:5.3, IE10:12.3, FF:17.7, CH:41.8, SF:8.1, MOBILE:20.4