The apostrophe is supplanted with h, in cases of ambiguity, and eliminated, when not ambiguous with VV in grammatical Lojban. A downside to this scheme is firstly that /'/ is not only [h] or an assimilated variety thereof, but also [T] (th), and secondly that <h> may be required as an allograph of . A (never-used) solution might be to use <q> instead.
Deleting all apostrophes and respelling i and u in diphthongs with y and w. (This then makes h available as an allograph of x.) An objection to this is that the dual use of y (sometimes representing [@] and sometimes [j]) violates audio-visual isomorphism.
Mark Shoulsonstill likes the idea of permitting h as an allograph of '. It's easy to read and hard to miss or mistake. Especially handy in manuscript. This is distinct from And Rosta's orthographies, in that this is the only change advocated. Indeed, this is the only viable option is certain computer environments, for example, where ' is not allowed.
Jay Kominek likes it too, thinks the ' is silly, but mostly keeps it to himself, because it doesn't affect the way anything works.
Or at least where use of ' is horribly complicated, as ' has a lot of meaning attached to it.
kreig.daniyl. prefers to pronounce ' as /T/, so he doesn't like using h. However, he wonders how one italicizes just an apostrophe on wiki...