I hate responding to such a ridiculous discussion but as a numbers guy, it is warranted. First off, 1998 seems like an aberration on typical injury levels. But ignoring that factor, how one can compare one single season of salary lost to 18 seasons of salary lost and claim some massive increase is beyond comprehension. I would suspect 18 seasons of data would likely be a much bigger number than one, but that's just me.
Let's look at 2001 versus 2015. The cost of replacing injured players rose 106% from $337M to $695 million. But player salaries rose over 86% in that same time frame. So not much of a difference. I do think teams are much more willing to IL somebody today than in the past as they look to protect their large investments but it's not like it's some massive difference that is being alleged. It's also almost certainly tied to increased TJ surgeries.
Of course what any of this has to do with practice is a whole other matter.