These rules also prevent previous blocks from being modified. (coinscage.com)
Well to start things off, SegWit2x will be a hard fork, meaning it will not be compatible with previous blocks (a.k.a. the entire existing Blockchain). (thenextweb.com)
Some universities are hailing possible new flexibilities, but Dr Yovich says one issue for Murdoch concerns previous block grants now becoming allocations for specific programs, some calculated on the number of students in each. (businessnews.com.au)