While Lotus can clamp down somewhat on price gouging on the part of the dealers, it's highly unlikely they will pressure dealers to not do it at all. The dealers are franchisees, they run their own business. They put together business models that work for them, which includes covering the cost of doing business in their respective regions.
What one is more likely to see is that most dealers won't add markup for initial depositors, when someone drops out, rather than moving everybody up a notch, they will 'claim' that spot as theirs, add the markup, and shop it down the line, offering placeholders to either keep their place in line, or move up by paying the ADM. Failing that, they will shop the spot to people not even in line.
While there may be a few dealers that are Lotus only, for most Lotus is an add-on brand. One they can do without. Lotus needs dealers more than the dealers need Lotus.
If past is prologue, the Emira will be a cash cow for the first year, maybe two. Once everyone who wants one has one, you will see dealers dropping Lotus fairly quickly.
Happened with the Elise. While they are very different cars: the Elise being very niche and the Emira more mainstream, the Emira has to deal with something the Elise didn't: competition. Good or bad, there simply wasn't anything like the Elise on the market.
The Emira has to compete with established brands and models for Porsche, Chevy, BMW, etc. So if the dealerships find the cost of carrying the brand isn't offset by revenue generated, they will drop the marque.