If the 2019 Toyota Avalon isn't fit enough to survive, then the entire full-size sedan species is doomed to extinction. It's really simple as that, because as the new-and-improved replacement for a car that was already well-entrenched as the segment benchmark, it stands the best chance of coaxing customers away from an onslaught of SUVs and similarly priced smaller sedans with fancier badges. Perhaps it could even snag a few people not yet old enough to collect Social Security.
That last point is key, because at 64 years old, the current Avalon's average buyer is actually a few years older than the segment average. While there's certainly nothing wrong with building a car for retirees, one must also acknowledge that fixed incomes and well, the inevitable march of time, will erode your customer base even more than it has (from about 71,000 when the current generation was introduced to about 32,600 in 2017). So, while Toyota isn't trying to capture young buyers, knocking a few years off that average would be nice.