Maybe. 20 years ago most people wouldn't have had an always on device in their pocket, let alone an always on device with constant internet access. Think of all the new always on and always connected devices people have now, from phones to smart fridges to Amazon Echos to video doorbells. Is a node that big a leap? And even if it is, then people can still use mobile Lightning wallets which will use a third party back end and let the end user use Lightning extremely easily.

Having no new coins entering circulation will just make it even more obvious what absolute nonsense taint is, since every coin will have enough history to be able to be classed as tainted by almost any metric.