It seems to me that this thread has gone off track to a certain degree.
What does the world "spiritual" really mean to most people, especially those people who use it a lot? In my opinion, "spiritual" seems to mean "having religious or pseudoreligious beliefs or values outside of the confines of an organized religion". This definition would cover the "spiritual but not religious" person who believes in Jesus and angels and holy spirits at home but diverges from most organized religions' definition of such. It would also cover the New Ager's belief in crystals and alternative realities and other planes of existence.
If this definition suits, then I would say that I'm not at all spiritual.
With the rise of individual social diversity, to most people the word means further clarification is needed.
In the vernacular, the word implies a few different possibilities.
On the other hand, in the critical, it depends on who's using it for what purpose as to what the meaning implies.
If, for instance, Sam Harris states the word, then it would imply your understanding.
If, on the other hand, it is being used by someone like Sam Keen, then the word would be more general in its implication and refer to things every human experiences because Keen's use of the term is more regarding the emotional response surrounding the phenomenon of reverential behavior and the provocation thereof.
So it is a wide ranging term, but again, that is due to the context of the term.
If it's being used by an adherent to some belief, then the word is specialized and subjective to their perspective.
However, if the term is being used objectively to describe a state of interaction behaviors by humans in commentary, then the term will be more benign and descriptive of general behavior and likely relate to sensory stimuli if the address is also philosophical discourse regarding known matters of neurology thus far.
One of the nice things about the word being subjectively slippery is that it permits a merging point between non-religious and religious individuals; permitting folks like Sagan and Tyson to claim "spiritual" experiences and identify their craft as "spiritual" as well.
Which means, it permits for the portrayal of science as a spiritually satisfying pursuit; which permits advocates of science to show how non-scientific holdings aren't needed for the spiritual satisfaction.
Taking the word out of the lexicon is probably not going to happen outside of the normal vernacular evolution; meaning, it will fade as time moves forward in much the way other similar words have.
As it is, the word has come a long way.
It used to be rather specific in its use, while today the word has evolved and moved.
As subjective experience states become more secular in expression, I expect that words such as "spiritual", as well as many other words, will alter over time.