Ebay should directly accept bitcoin payments and then it would be good enough as PP can be charged back but not bitcoins. Their split up with PayPal has not made a significant difference as they only offer that payment option for US goods. For Indians they do have another payment option paisapay but that's also not good enough.
ebay wouldn't do this directly because they thrive on the fact that the buyer is protected so some sort of escrow would need to be used and that's essentially what Paypal is, but obviously it can be easily gamed. Paypal need to start footing the bill out of their own pocket when something doesn't go right but that wont happen so the alternative is to stop using them but that wont happen either.
PayPal supports the buyer/sender of the money in any case and thus the seller gets no protection whatsoever. A solid proof needs to be submitted to win a dispute and hence PayPal is not a convenient payment processor. Bitcoin payments will at least be a safe method to avoid chargebacks but still it can be abused if the seller is a fraud. In that case, ebay can offer an escrow as you recommended where the funds are released after the item has been delivered. Bitcoin payments are not restricted to any country unlike PP which is not an allowed payment processor in few countries.
Ebay may adopt bitcoin payment due to its popularity and we can only hope that it does happen.