From a Celts fan perspective, I like the trade. Thomas will be getting a max contract somewhere next year. The Celts have Irving under contract for at least two years. Losing the 1st pick stings in theory, but knowing we get the Lakers 1st pick takes the sting out a little. Losing Zizic may be the thing that bites us in the ass the most in the future. Big guy w potential.
As much as I loved Thomas last year, it's still hard to ignore his injuries late last year and his style of play. The way he plays opens him up to future wear and tear that I'm not sure he can handle over another 5 years.