While I'm not an expert in this field, messenger RNA, like all RNAs, is degraded by RNAses, and there's specific complexes of proteins (such as the exosome complex) that target messenger RNA specifically for destruction. If you don't have anything producing more mRNA in the cell, then, eventually the injected mRNA will be degraded and no more translation of it will occur. Because this vaccine isn't rewriting the cell's DNA (unlike the virus itself), there's nothing to produce further mRNA encoding the spike proteins.
The lifetime of mRNA in mammals ranges from a few minutes to a few days; the exact mechanism that controls the lifespan isn't well understood.
Given that this article is an opinion piece from Bloomberg from an author whose articles are about competitive pressures and stock prices in the technology sector, calling him or what he's proposing "socialist" is more than a bit of a stretch, I think.
Instead, I think it's more accurate to say Mr. Culpan is thinking of what will make for Shareholder Value, anti-trust laws be damned. That's not very "socialist" at all.
I remember those days. I was one of the paid community supporters before they went commercial, and when they did, I got free lifetime custom DNS service for a single domain as well as free lifetime premium service for dynamic DNS in the dyndns.org domain. The quality of Dyn as a provider, and their willingness to keep their end of that deal (unlike, say, Joyent), is why I use them as my registrar and why I've recommended them professionally despite the fact that there are far less expensive alternatives (such as AWS Route 53 or Azure DNS).
Shortly after the deal closes and integration begins, I expect that my lifetime service will be terminated ("to better serve our customers"), the cost will skyrocket (because this is Oracle we're talking about), and I'll be forced to move to another provider. It was fun while it lasted, I suppose...
The superior man understands what is right; the inferior man understands what will sell. -- Confucius