I won't say never because we really don't know how the future economies going to be evolved and what role bitcoin will play in that! Also I don't have a timeline either because paypal is running a very complex business model. They have to comply with the local laws of every country they are operating in. So it's hard to say how long it will take to see a standerdized regulation around cryptos.

But it all depends on the legislative framework. Like in Japan l, bitcoin is legal. So paypal probably add crypto support for Japan but not in other countries where bitcoin is banned. The clearer regulation we will see, the morr prominent chance we will see for paypal to accept bitcoin.