aakk9999 - 12:36 am on Nov 21, 2013 (gmt 0)
I do not have such site, but I am wondering whether this more affects the sites that "have not moved with the time" and remained unchanged for years - perhaps out of fear that changing something will impact the current good ranking.
Perhaps IBLs are also problematic not because there is lots of old such IBLs, but because, as the site has not moved with the time, it might have not have acquired new "natural" IBLs. So if the only thing that propped the site before was old IBL using old style link buildings, I can see how this site could drop when the algo changes - nothing to counterbalance.
I am wondering how such old site would fire if it was completely redeveloped and maybe the old URLs with old IBLs just let go 404 - I am wondering has anybody tried this and what were the results.