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I watched a couple of Taylor Marshall videos on the subject of Fatima and Francis' upcoming consecration. TM is repeatedly saying in two separate videos that Sister Lucy says in 1936 "Pray very much for the Holy Father, he will do the consecration of Russia but it will be too late. Nevertheless the Immaculate Heart of Mary will save Russia.  It has been entrusted to Her."

I've heard the quote that says it will be late, but never heard the quote that said "too late".  Apparently, Robert Sungenis is also pushing this "too late" thing. 

If Our Lord's follow up message about the Consecration will be "too late", will anyone want to bother? 

It says Russia will be saved in the very next sentence, so obviously it isn't referring to that. It's simply saying it'll be too late to avoid the errors of Russia spreading.

I've heard the quote that says it will be late, but never heard the quote that said "too late".  Apparently, Robert Sungenis is also pushing this "too late" thing. 

Apparently, you are referring to a recently published 118 page book by Sungenis, Fatima Fulfilled But Still Foreboding.  Sungenis discusses this work in the below video.  His basic contention is that the Consecration was done by Pius XII, but in an imperfect manner (including the 1952 wording "peoples of Russia" rather than simply "Russia") and with consequently imperfect results and that as far as the Consecration goes it is history, although the full mystery (i.e., the 3rd Secret) of Fatima is still foreboding.

I am of the impression that most trads who have weighed in on the correctness or lack thereof of Sungenis' conclusions regarding Fatima have utterly failed for whatever reason to actually weigh the evidence Sungenis has presented in determining how he arrived at the conclusions he has.  I say that because I have never seen or heard them reference it in the detailed way Sungenis has.  Rather his conclusions regarding the Consecration seem all too often to be dismissed out of hand because they don't fit the normative trad Fatima narrative, the very narrative which Sungenis wrote extensively about, spoke about, and supported for many years; and the very narrative which he finally came to reject.
https://www.robertsungenis.org/2021/08/the-meaning-of-catholic-fatima.html

Fatima Fulfilled but Still Foreboding with Dr. Robert Sungenis