This proposal, clearly, is meant to test the waters in order to decide what to do after Tornado. After all the mess we've been causing with most multi-national aviation programs, I currently can't see anybody risking to develop another expensive aircraft with the Germans.
Even more importantly, the Tornado replacement in ITA and GBR has already been decided. So it may well be the result of this proposal - "well, we haven't found anybody willing to cooperate, so we have to look for what's available right now".
"Coincidentally", I know that the German MoD is actually looking into different options on how to deal with Tornado. Another extension of its service life (possibly up to 2040) is one of them. However, purchasing a new, market-ready aircraft is being seriously considered.*
Given the growing awareness of the German public for defense matters, and considering the crucial role of Tornado with regards to Nuclear Sharing, an American aircraft may well be the answer. F-35G anyone?
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* This is actually not as improbable as it may seem. Quite recently, the MoD ordered the CH-53G out-of-service date to be brought forward, and since the European HTH program is officially dead, the replacement will be, has to be a "foreign" helicopter.