“While Broadway is celebrating the most bullish season in history — both in attendance and box-office grosses — the gulf between the artistic and the commercial seems wider than ever, the former solely as the province of the not-for-profit theaters, the latter as so much fodder for Broadway. Yet as bleak as some critics may paint the musical’s future — and they’ve been doing so for decades — there appears to be little hand-wringing these days among Broadway’s cognoscenti…”