God, give me strength! The M113 has been one of the MOST versatile, flexible, and successful APC’s ever built anywhere! It’s ‘replacement’ is the Bradley IFV, not the Stryker. At one point, it looked like the M113 was going to go out of the inventory entirely, when it was discovered that there just wasn’t a suitable commanders track to go along with the Abrams and Bradley’s, and the Bradley was considered too expensive to either modify or ‘waste’ as a commanders vehicle. Thus, the M113/A3, which with its significantly upgraded suspension and power train can easily keep up with an Abrams over any terrain (and I believe the medics use 'em as ambulances as well these days). M113’s have been produced in more versions, for more purposes than you can shake a stick at, and all (with the exception of the A3’s) using the same chassis, engines, tracks, etc, etc, etc. It’s not just about what an individual vehicle can do, it is what a whole FAMILY of vehicles can do. Commonality of parts is the name of the game as far as logistics is concerned, and it is logistics that keeps an army in the field, instead of a resupply depot you knuckleheads! For all these reasons, the M113 remains an outstanding vehicle that can be easily modified to do just about anything, and can accommodate just about any kind of equipment you can think of (at the end of the day, it is an armored box; put anything in it you want!).
Is the M113 series a ‘recycling project?’ Well sure! That’s the whole point, you maggots! I can tell you, the M577A1 (command track) that I commanded through the first Gulf War was recycled from a Vietnam casualty 20 years before (and you could still see where the RPG round had gone through the drivers compartment, despite the welded-over hole in the armor!), and it did the business needed well enough, but I admit, I was VERY jealous of those M113A3’s (those things can MOVE!)…
As for the Stryker, it has its good points, particularly in an urban environment, but it has some significant drawbacks too. It is a tall vehicle, which means it has a lot harder time keeping low and out of sight. It is a wheeled vehicle, which means it has a harder time negotiating difficult terrain. It is also a complicated vehicle, and complicated means ‘more to go wrong,’ which is not helpful if you are on the move for long periods. But the Stryker can be deployed quicker and easier than a M113, is faster on roads, and carries significant firepower where it is needed at a much cheaper cost than a Bradley, and when you consider that the planners were thinking that wars in the future were going to be ‘brushfires’ and short deployments, it looked like the Stryker would be a real winner. Of course, they hadn’t figured on Iraq lasting like it has, or turning out like it has either! At the end of the day, the actual ‘war’ was fought and won by Abrams, Bradleys, M113’s, and our good friends in the sky (all of 'em!), and the Stryker has yet to deal with an opponent with armor, so I’m not sure you can say it has been fully ‘tested’ yet!