Depends. If Apple just wants to support Visa or MC, definitely not. But if they want to support the German debit network they might need to.
I doubt it's even possible to connect a girocard (aka EC Karte) to Apple Pay. There is no way to pay online with a girocard, it doesn't even have a real card number (just a placeholder one that's only useful to tell the operator which card was stolen).
You can only pay using the chip with PIN or the magstripe for ELV with signature (or maybe it's chip+signature for ELV nowadays but that doesn't matter).
It's the same deal with Maestro or V-Pay. The majority of German bank cards are not full Maestro cards like the ones you can get in the UK that have a CVC and an actual card number. Maestro and V-Pay co-branding was only intended to be used for vacations in continental Europe, for use in terminals and ATMs.
It's an overall very precarious starting position for Apple Pay in Germany. As far as I know at least, including girocard/Maestro/V-Pay is not possible. MasterCard, Visa and Amex is possible, but those are not particularly widespread.
Lots of modern direct banks usually come with a free Visa or Mastercard debit or credit card, but let's not kid ourselves, LOTS of folks are still with credit unions or savings banks, or Deutsche Bank, commerzbank, spardabank, HypoVereinsbank, etc. none of which actually offer free credit cards.
They might offer Apple Pay, but they're not suddenly going to offer free credit cards. There's not nearly enough pressure for them to do so. The target group is small.
Then again, as someone stated before, Apple is losing momentum. If they're going to wait forever for credit card adoption rates to rise and release Apple Pay in 5 or 10 years, it's just going to seem pathetic (whatever the reason for the holdup was).
At this point, a lot of terminals are already prepared for contactless payments and folks without a credit card or a MC/Visa debit card will probably be out of luck.
It's going to be interesting whether in the long run the German Banks with their girocard will win, or if Mastercard and Visa take over. One thing is for sure though: To avoid unpleasant surprises when shopping in Germany, you better still take cash with you
