If you will analyze and dig deeper into what Paypal did, you will know the answer to this.
If you will just base this base on what Paypal did, in case you didn't know you can only just buy and sell Bitcoins to their website. Take note that you can't use it to buy another things and the worse is that you can't transfer the Bitcoins you bought so in short, what Paypal did is they just implemented an exchange like thingy in their platform but worse than the normal crypto exchange since you can't withdraw it at all.

Now to answer your question. Yes it adds awareness to those Paypal users but in terms of mass adoption, I don't think that this is the catalyst of it. If Paypal will add another features that relates to crypto like possible transfer of Bitcoins to another wallet or the like then probably yes.