5 years would be a remarkable effort if we achieved it, unprecedented in the history of the game.
Even more so given in that period we would likely have to replace the talent of Cotchin, Riewoldt, Edwards, Grimes, Lambert, Lynch, Martin, Pickett, Prestia, Tarrant and potentially Broad, McIntosh and Vlastuin.
Going to be a spectacular list regeneration if we can pull it off from a position of contending.
Our regeneration strategy will be over a number of years. Of those that you have mentioned:
Cotchin - Essentially replaced by Hopper going forwards
Riewoldt - probably the biggest concern. Club may be confident on Ryan / Bauer
Grimes -
Lambert - Barely played last year so essentially already replaced in our team. Had a few things gone right last year we would have finished top 4. Bakes / Clarke / Short already in this position
Edwards - Similar to Lambert, hos dynamism in midfield was not there last year. Reckon will be replaced by the Sonz
Lynch - Similar to Jack, the biggest concern on our list, will play at least another 3 years so we have some time
Martin - Mid minutes probably replaced somewhat by TT, will play forward and IMO will play at least another 3 years. Shai has already replaced some of his dynamism through the midfield
Pickett - A fit enough 30 year old. Will play at least another 2 years, we have HRS and Banks on the list that will hopefully be ready to take over
Prestia - Will play a few more years yet, so this ones a wait and see
Tarrant - Will probably be replaced by Miller in that stopper role
Broad - A role we need to fill, but hopefully do something similar to when we got Broad (latish pick). Reckon Broad has at least another 3 years in him though
McIntosh - See Pickett, but still got a good 2-3 years in him
Vlastuin - Could easily play another 5 years, we have Brown in the 2's, he could come in for Broad or Vlastuin when needed, but I don't see Vlastuins as an imperative one we need to fill right away
So in summary, the Hopper / TT trades have enabled us to replace a few already. The 2 biggest questions are Jack and Lynch, key components to the team absolutely, but we don't know what the teams plans are to replace them just yet. Potentially they have Himmelberg or Marshall lined up to come in as free agents either end of 23 or 24. We do plan way out, so its a distinct likelihood that we are looking at these replacements already and have planned ahead.
Personally I think we are playing this very well. Rejevunating with very good players when we don't have access to those high draft picks, target those that have slid in the draft (like Sonsie and hopefully Lemmey / Scully this year) with the aim to iron out the issues as to why they slid. Most of the players you mention will play at least another 3 years anyway so we are restocking now to take us forward into the next 3 years.
IMO, we will rotate between drafting and taking players via trade, whilst also using free agency occasionally where possible (reckon we are already targeting someone like Marshall as a FA at the end of 2024).