The problem with this approach is that they can cooperate with those, who installed keys to your doors, so they can install the piano anyway. And then, you can try to find a better home, or change keys to your house (while also forcing all of your neighbours to do the same thing).

Or, speaking without analogies: spammers can still cooperate with miners, and use as inefficient methods as they want. And then, you can change the coin, or 51% attack it, and reorg the spam.

Well, in the past I thought, that many people want to have a coin, which works as a payment system. But now I know, that many people want to spam the chain, and see no problem with that (including some developers). And in that case, I am not the one to save those, who want to hurt themselves in the long-term scenario. Then they deserve it, and they should use today's methods of spamming, because they are far from the worst, what can be done.

So, if the community want to have a spamchain, instead of blockchain, then it is their choice. You can still improve your node, and be somewhat resistant to the spam, if you really want. And the rest of the users, who want to process the spam, should be left, where they currently are, because then, it will be easier to remove it all at once, if spammers will commit to some bad design decisions, and build some protocols on top of that.

To sum up: there is a plan for non-spammers, who want to have a payment system. For everyone else, there is spamchain. You, as a user, can run any software you want. It is your choice.