I can only guess most, if not all, scientists/scholars/researchers should have their professional training, skills, ethics, protocol and system to produce their conclusions/suggestions that could be right or wrong years later.
Basically, I think the scientists can only do and say right now is what exactly they currently believe is right for now, according to conventionally scientific research methodologies/protocols.
Of course, there is possibility for re-adjusting old raw records by certain researchers as you guess, but I think the probability should be extremely slim.
Besides, adjusting raw data records, such as outliers, might be a proper and normal step in standard research protocol, if the adjustments are based on strong scientific reasons/causes. I just guess.
We usually very much believe scientists, and their update of scientific knowledge from time to time. Why not this time?
If someone truly believes the raw data has been compromised/changed, however no solid proof could be found Yet about the adjustment, then the argument hence created will be a never ending one, that could spend unlimited time for almost zero result - nearly guaranteed.
Personally I don't understand well the objective of climate scepticism. Is it simply for social justice, proving the alarmists lied for their wrongdoing of adjusting data?
Good luck to the evangelists of climate scepticism! They do have unusually great courage!
Perhaps they deadly need a whistle-blower! Perhaps a potential whistle-blower would show up anytime soon! We never know!
Let me predict the future of this nonsense...
In 30 years "climate change" will be viewed as a debunked scientific fraud which late night comedians will make fun of.
The reality is that the biggest threat to human existence is falling global temperatures. We are near the top of a short term peak and by 2020 most of the measurements will show a decreasing drop each year - to the point that adjusting the data can no longer "hide the decline".
Certainly the climate cabal by the mid 2020s will try to claim that they have been successful because the temperature is dropping globally. However this will not jibe with the global evidence of increasing CO2 levels while the temperature declined over the previous decade. The climate accords will not slow man-made CO2 growth to any measurable degree as larger emerging nations significantly increase their output over the next decade, more than offsetting any cuts from first world nations.
There are enough directly visible environmental pollution problems that should be tackled before unproven AGW. Sadly, as Wall Street financiers will make a fortune off of crony-capitalism carbon credits, the politicians will misdirect money to fight "climate change" leading to misery and continued poverty in the few emerging nations that attempt to reduce carbon-based energy usage.