Word that means make something available to the working classes

In this context, the package holiday "revolutionized" travel.

https://www.thefreedictionary.com/revolutionizing

I found it remarkably difficult to come up with a verb that has this kind of specific meaning.

There is no verb form of the adjective available, which would be ideal.

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However, in thinking of something that is at first available to only a few, but then becomes something routine or common, one verb is commonize:

[Merriam-Webster]

: to make (something) common, standard, or universal

// Because the book is considered to be so highbrow I wanted to “commonize” it a little bit. I didn't want to fall into the trap of being inaccessible.
— Kari Skogland, quoted in The Calgary (Alberta) Herald, 23 May 2008

// We have to reuse and commonize what has worked and what has been well received by the customers.
— Birgit Behrendt, quoted in Automotive News Europe, 13 June 2005

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Ironically, it's not a common verb, but your sentence would become:

Travel was for the wealthy but the introduction of the package holiday commonized travel.

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Other less satisfactory verbs I had originally considered included disinhibited, unleashed, derestricted, liberated, unbound, unchained, freed, and unfettered.