Here is the way I see it...
Based on the number of races and classes provided in previous editions, in *different* books, the fact that the designers are including all those races and classes in one book makes me feel like I would be paying $50 for 1 and a half books worth of content.
The 5E book will have support for the stuff introduced in 4E's PHB1 and 2. With class options (like features and spells) to support those classes.
The 5E book will have support for the stuff introduced in 3E's PHB1, and the Warlock. With (more robust) class options (like actual class features for fighters and more and spells to cover each spellcaster) to support all those classes.
I like that this book looks like it will let me play races and classes in (or spiritually recreate any character from) any previous PHB1, from the start of the edition. No waiting a year for the next splatbook to recreate a basic concept from my previous campaigns.
That is both inclusive, and a good value in my eyes.
I'd rather pay $50 for this book (and have the true baseline representing the starting point for anyone that has played an edition of D&D), than to pay $40 for part of that content, and have to wait a year to pay $40 to get the other half of that content.
You all know that if the designers did *not* provide all that content in the PHB, they would be viewed as liars and villains for not following through with that big promise that they made. Some people will complain either way, changing the goalposts of their expectations, or making unrealistic demands, hoping Wizards will fail. I hope those voices are identified and ignored, as they don't have the best intentions. They just want to see it all burn.
Also, if someone *likes* 5th Edition, but balks at the pricetag, perhaps they should reevaluate their entertainment values and priorities. Personally, depending on where you buy it (online or FLGS), I think that 1 PHB bought for $30-$50 as a player, or 3 Core books for $90-$150 as a DM, that lets me play a supported edition I like for years to come, is far more valuable than the same amount of money spent on video games or going out to the movies. If money was tight, I'd stagger the purchases in the following order: PHB, MM, DMG.
... in my opinion.