The gall of you demanding simple, one sentence replies is hilarious given your history of long winded replies that say nothing.

I will gladly answer your questions if you will demonstrate even a minimal understanding of drivechain and the rationale its proponents have for it, at some point.

First, DC is not "on" bitcoin. As a side chain it is a side process. A value adding feature like many BIP's. Some are implemented without breaking BTC, others are used or ignored by wallets and miners at the consumers discretion. "On" bitcoin would be something like Bitcoin script or UTXO's, core features that are bitcoin itself. BIP 39 for instance is not "on" bitcoin, it's a value added improvement that impoves user interaction. For me this distinction is important

DC is already hardforked, It has a testnet hardfork of bitcoin to test new features and transition for main, along with an implementation of zcash and eth as examples of what can be done.