I don't see a problem with the Stryker's role. It provides protected mobility for infantry in a package that's lighter, has a lower logistics footprint, and has much higher on-road mobility than the Bradley. It provides greater protection (esp. vs underbelly attacks) and a lower logistics footprint than the M113. It fills the niche between unarmored trucks and heavy units.
Future Strykers are getting a double v-shaped hull to further improve underbelly protection (up to "MRAP 2" levels).
Estimates put fuel usage of an SBCT at almost a third of that of an HBCT (~100 tonnes/day and ~300 tonnes/day, respectively). (source: http://www.rand.org/pubs/monographs/2007/RAND_MG649.pdf)
Yes, the Stryker vehicle itself does sacrifice some off-road mobility to do so.
IIRC, light infantry platoons don't have any organic Javelins right? They all come from the company. Maybe I'm misremembering.
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