Crazy to hear him mentioning retirement, in any capacity, right now.
I see a lot of comments in here about what he does on a football pitch being taken for granted, but the reality is that for any true great in any sport, their base level is processed and assimilated, and their measure of greatness taken from what they do against those deemed to be their peers in the biggest, most important games on the grandest stages available to them.
Whether fair or not, the yardstick for players like Messi is more in performance in maybe 20 elite games in an international season, and perhaps 12 or so in a normal one. That's not to say the rest of the season, against opposition Barcelona/Messi are supposed to trounce don't count, but rather it's nothing that will earn plaudits in isolation without big performances in the aforementioned elite games.
All truly great sports people are measured by a different set of metrics to those outside the tier they reside in. It's definitely not Messi alone who is a victim of his own ability as we see it - obviously not to the same extent - with someone like Neymar, who, let's face it, has been solely reduced to what he does or does not do in the K.O. stages of the C.L. and any latterly stage for his country, since moving to P.S.G.
Being better than players you will always be better than does not capture the imagination in anything like the same manner as being the top dog against opponents who are being hailed as the next big thing or usurpers to the established order. The general public want to see gods collide in battles for the ages; I don't think it's a particularly bad thing, either.
Messi is accepted as peerless in La Liga - I think that's about the greatest acknowledgement that can be bestowed upon any great in any league. By proxy, and as a consequence, however, said player has to do extraordinary things (even for him) for acclaim on top of acclaim, rather than an accepted level of standardisation that renders their normal another players great, and their good another players performance of a season or even career.
Such is life. Heavy the head that wears the crown, and all that.