The future of engineers in TAC is the same as the future of engineers in any other group:
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Begrudgingly get promoted up to GL 10 - 11 with multiple years in between.
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Do the best they can to keep you pigeon holed into a specific technology hoping you will ride it down the tubes so they don't have to replace you and train a new person.
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As product revenues fall with the corresponding service revenue slowly weed out the more expensive older employees.
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At some point just axe the group you are in entirely and let you scramble to find a new position or ignore you as you walk out the door.
This is a repost from @LUmw7hP-3ypq , OP nailed it.