Remodeling Magazine publishes a Remodel Cost Vs. Value Report each year which includes cost data for a variety of different remodeling projects organized by regions across the U.S. For your region, their data indicate a $21K cost to remodel a 5' x 7' bath at a mid-range quality level. Your master bath is larger and presumably you'd want a higher quality level, too. Here's a link to the online report:
https://www.remodeling.hw.net/cost-vs-value/bathroom-remodel?y=2019
If you want to forgo a shower door, our rule of thumb is that you'll need at least 5 ft from the shower head that is protected with tile or glass. I don't see how you're going to achieve that based on your current plan. In addition to its effect on your vanity, splashing creates a slip/fall hazard in the area between the shower and toilet.
Regarding your question whether eliminating the tub will torpedo your home's resale value, the answer is that it depends. It depends on 1.) consumer preferences in your local market, and 2.) the demographics of the most likely purchasers of your home.
Best wishes for a successful project!
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