Thinking longer term... perhaps mixed types in the circuit are not a good idea. It SHOULD be OK; we're all sensible, we all have eyes, we all have radios. But I know from flying a helicopter that many people just don't seem to realise that helicopters slow down before they land.
And not all of us are perfect all of the time, and some probably shouldn't be allowed to fly!!! Now, while whirly things definitely don't need runways, a proportion of A/G operators and FISOs want everyone in the same circuit and using the same runway. In a similar situation, in a helicopter, I'd say damn the guy in the tower and what he wants, and I'd pull off well to the side and get out of the way...but microlights aren't quite that manoeuverable. So perhaps it would be sensible to have separate parallel grass runways for microlights and other slower aircraft. There's enough room to do it at practically every airfield I can think of, apart from very small ones that probably don't have the traffic to need to anyway. So...why isn't it happening?