He wants the same as his hero now he can't break any records, seems a fair goal.
And he's already a legend of the sport, not sure how that's even debatable. His wider Motorsport career post F1 will just grow it.
He is not a legend of the sport perception differs from reality.
How so?. He's still widely regarded as one of the best, if not the best, on the grid at 36 and has been for over a decade. That sort of longevity and the stats he does have across his career alone gets you in. Then the fluff...
He went toe to toe with Schumacher without much if any a car advantage twice and won twice. Missed 3 other titles by 1pt,3pts and 4pts across 2 other teams without being in the quickest or best car. Has one of the best seasons in history under his belt in 2012. Has over 30 wins,20poles and 90 podiums despite never being in dominant machinery for an entire season unlike his rivals. Has won for 3 different teams and 3 different engine manufacturers. Has the best qualifying record on the grid vs. team mates despite facing 4 WDC's(3 over a full season).
Pure denial that he won't be remembered as a legend even if he never wins again in F1 or even IndyCar and WEC after it. He's not some 24 year old untested newcomer that's about to be found out for goodness sake, everything from here on out that's good will just grow that legend and bad would be put down to age.
Gilles and Sir Stirling are legends too, as are lots of drivers with worse stats than Alonso. You're genuinely the first person I've come across that doesn't think he's a legend and I know plenty that hate him with a passion.
WHERE you place him is a whole different story of course but denying he's in there is a new one on me.
"Clark came through at the end of the first lap so far ahead that we in the pits were convinced that the rest of the field must have been wiped out in an accident."
-Eddie Dennis, describing the dominance of Jim Clark in the Lotus 49 at Spa 1967