Yes, given the predicament with an important and prestigious industry literally poisoning the tax-paying electorate, it is quite possible that a new EV incentive will be introduced.
Since the legislators try very hard to exclude Tesla, I can imagine a policy that not only reserves a given amount of money for incentives (which the taxpayers will appreciate), but one that also limits the number of eligible cars per manufacturer. I basically imagine that the legislators will instruct each German auto maker to estimate how many EVs they will sell in Germany within some number of years, given a stipulated incentive (and no talk about fines to emissions cheaters). Some weighted average of this estimate will then become the cap for each EV maker - maybe counting all EV-sales so far in Germany, if that helps to minimize the number of eligible Teslas. I guess only historical EVs sales with at least 5 seats would be counted against the quota (of eligible cars with any number of seats), for the benefit of BMW. Yes, legislating is difficult.
Back in 2014 I managed to get a Tesla brochure from the Munich store, it hangs at my office door, so I already have a long list of people that I had to promise a test drive once my Model 3 arrives.
PS. Should "will have no chance to extend" be read as "will have no chance but to extend", or no?